Finding the Fourth Proportional to 112.78, 155.72 and 69.18

Step by Step Solution

1. Step 1: Write the proportion equation
   112.78 : 155.72 = 69.18 : x
2. Step 2: Convert to fraction form
   112.78/155.72 = 69.18/x
3. Step 3: Cross multiply
   112.78x = 155.72 × 69.18
4. Step 4: Simplify right side
   112.78x = 10,771.93
5. Step 5: Solve for x
   x = 10,771.93/112.78
6. Step 6: Final answer
   x = 95.51